This machine was giving me fits all morning. Parts kept getting stuck, and then, because I was at the other end catching the finished parts, the next piece or two would slam into the stuck part, causing a mess. Not every part. Just enough that It would lull you into thinking everything was working. And then - Whammo!
Turns out there was a small nick in the lower edge of the feed chute to the next section. If the metal flexed down, it caught the nick.
A little TLC with a pliers and file and all is well.